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Geometric Dimensioning and
Tolerancing (GD&T)
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FREE!
Click the image below to download a full size PDF of the Staging Sequence
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Geometric Dimensioning and Tolerancing (GD&T) has been around in one form or another since World
War II. The need to define ever more complex part geometry and the need to guarantee
interchangeability of parts has contributed to its widespread use. Today, it can be found in
nearly all manufacturing industries, from the very small geometry found in Integrated Circuits
to the very large geometry found on rockets, the Space Shuttle and the International Space Station.
It has found its greatest application in mass production, where interchangeability of blindly
selected parts is essential. Just-in-time manufacturing increases the demand for parts that
absolutely must fit at assembly, as it is much less likely today to have spare parts waiting
in the warehouse. Parts simply must fit together at assembly.
GD&T is equally beneficial in R&D and one-of-a-kind components and assemblies, as there is no
other way to ensure that the allowable variation of part geometry is adequately defined. Indeed,
that is the point - to define the relationship between geometric features on a part to ensure
the part will work. Whether it is the form of the surface of a cam, the coaxial relationship
between the head of a bolt and the thread, the location of a pattern of holes, or the location
of a bracket in an assembly, GD&T is absolutely the best way to define the variation allowed
between part features.
In our GD&T training and GD&T courses we teach the concepts, rules and language of GD&T. We
also teach GD&T from a functional viewpoint, discussing the topics from the point-of-view of
application to real world problems. Functional Dimensioning and Tolerancing is what we are all
about.
We offer Beginning, Intermediate, Advanced and Custom GD&T training and GD&T courses. We also
offer Functional Dimensioning and Tolerancing courses and GD&T Certification Preparation
seminars.
Beginning or Basic GD&T courses focus more on the meaning of the symbols and specifications,
and how to properly specify the needed tolerances. We explain the exact meaning of all the
Geometric Tolerances, Definitions, the Fundamental Rules, Feature Control Frames and Datum
Reference Frames. Functional Dimensioning and Tolerancing concepts are introduced and woven
through the curriculum.
Intermediate and Advanced GD&T courses are taught with the requirements of the final product
in mind, which includes the effect of the GD&T on Tolerance Stackups. Dimensional Management
concepts are introduced. We want our clients to understand the implications of the tolerances
they specify, including the functional implications and the cost implications of the assembly,
manufacturing and inspection processes. The many nuances of GD&T and the importance of syntax
and context are discussed in detail. Functional Dimensioning and Tolerancing concepts are further
developed and explained throughout the course.
If desired, our GD&T training and GD&T courses may be customized around your products and problems.
Custom courses can be anything you want. Our GD&T training has been successful in a variety of
environments and contexts.
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| Leading Edge Materials |
Although GD&T is a science of the details, it must also be understood in the context of
the big picture. If our clients are interested, we also explore the implications of their
Dimensioning and Tolerancing Schemes on the rest of their company, helping our students to
understand the tradeoffs in cost and quality they make when selecting various Tolerancing
Schemes.
Bryan Fischer, President of Advanced Dimensional Management LLC is an ASME Certified Senior
Level GD&T Professional, and a non-voting member of the national standards committee responsible
for GD&T and Dimensioning and Tolerancing in the United States. He is actively involved with the
development of the next generation of this important standard and recognized as one of the leading
experts in this field. Bryan has also written and published several books on GD&T, Tolerance
Analysis and related subjects.
GD&T Certification and Testing Information:
ASME offers technology and engineering professionals the opportunity to prove their knowledge of
ASME Y14.5M-1994 by taking either a Technologist Level or Senior Level Exam. The Technologist
Level Exam is designed to test your understanding of the content of the standard; the Senior Level
Exam is designed to test your understanding of the content of the standard, and application of its
principles.
Advanced Dimensional Management training and materials can help prepare your staff to take
ASME's GD&T Certification tests. Please contact us if you would like
more information
For a link to information about ASME's GD&T Professional
Certification Examinations and related Training Programs,
please click here.
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